Internal-crosslinking aqueous polyurethane emulsion and preparation method thereof

A water-based polyurethane, cross-linked technology, applied in the field of internal cross-linked water-based polyurethane emulsion and its preparation, can solve the problems of cumbersome operation, unfavorable construction, low cross-linking degree, etc., and achieve effective solid content, good mechanical properties, The effect of increasing the molecular weight

Active Publication Date: 2011-09-21
BEIJING RADIATION APPL RES CENT
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cross-linking methods for WPU mainly include internal cross-linking and external cross-linking. The internal cross-linking method refers to the introduction of a cross-linking agent during the WPU polymerization process to cause cross-linking of WPU macromolecules, but the degree of cross-linking obtained by this method is not High, at the same time, it is

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1. Preparation of internally crosslinked waterborne polyurethane emulsion

[0027] Mix 42 g of polyoxypropylene glycol (N-210, molecular weight 1000) after vacuum dehydration and 16.84 g of isophorone diisocyanate (IPDI) (wherein, the mass ratio of N-210 to IPDI is 2.49:1), Under the protection of dry nitrogen, the reaction was carried out at 100°C for 2h. After cooling to 75°C, 3g of dimethylolpropionic acid (DMPA) and 1.16g of pentaerythritol triacrylate (PETA) were added to react for 4h (wherein, the mass parts of DMPA and IPDI) Ratio 1:5.61; the mass ratio of PETA to IPDI 1:14.52), lower the system temperature to 40°C, add 20g of acetone to reduce the viscosity (the mass ratio of acetone to IPDI is 1.19:1), slowly adding The neutralizer triethylamine is added to the prepolymer, and then a metered amount of water is added under high-speed stirring for emulsification to obtain a milky white water-based polyurethane emulsion. The solvent is removed by distillation...

Example Embodiment

[0029] Example 2. Preparation of internally crosslinked waterborne polyurethane emulsion

[0030] 40g of polyoxypropylene glycol (N-220, molecular weight 2000) after vacuum dehydration, 12.54g of isophorone diisocyanate (IPDI) and 8.3g of 1,6-hexamethylene diisocyanate (HDI) were mixed (where N- The mass ratio of 220 to the total mass of IPDI and HDI is 1.92:1), and the reaction is carried out at 80°C for 2h under the protection of dry nitrogen. Then, the temperature was lowered to 70°C, 3g of dimethylolpropionic acid (DMPA) and 1.06g of pentaerythritol triacrylate (PETA) were added and the reaction was continued for 4h (wherein, the ratio of DMPA to the total mass of IPDI and HDI was 1: 6.94; The mass parts ratio of PETA to the total mass of IPDI and HDI is 1:19.66), reduce the system temperature to 40°C, and add 40g methyl ethyl ketone to reduce the viscosity (the mass parts ratio of methyl ethyl ketone to the total mass of IPDI and HDI 1.92:1), slowly add the neutralizing age...

Example Embodiment

[0032] Example 3. Preparation of internally crosslinked waterborne polyurethane emulsion

[0033] Mix 35 g of polybutylene adipate (PBA-2000) after vacuum dehydration, 8.4 g of toluene diisocyanate (TDI) and 6.0 g of 1,6-hexamethylene diisocyanate (HDI) (among which, PBA-2000 and TDI The ratio of mass parts to the total mass of HDI is 2.43:1), and the reaction is carried out at 80°C for 2.0h under the protection of dry nitrogen. Then the temperature was lowered to 70°C, 3g of dimethylolpropionic acid (DMPA) and 1.06g of pentaerythritol triacrylate (PETA) were added and the reaction was continued for 2h (wherein, the ratio of DMPA to the total mass of TDI and HDI was 1: 4.8; The mass parts ratio of PETA to the total mass of TDI and HDI is 1:13.58), lower the system temperature to 40°C, and add 40g of acetone to reduce the viscosity (the mass parts ratio of acetone to the total mass of IPDI and HDI is 2.78 :1), slowly add the neutralizer triethylamine to the prepolymer, add a mete...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses internal-crosslinking aqueous polyurethane emulsion and a preparation method thereof. The preparation method comprises the following steps of: (1) reacting polymer polyols and diisocyanate to obtain a polyurethane compound; (2) adding hydrophilic chain extenders and multifunctional hydroxyl-containing acrylate into the polyurethane compound for reacting, and after the reaction is ended, adding alkali for neutralizing and adding water for emulsifying in sequence to obtain the aqueous polyurethane emulsion; and (3) performing radiation crosslinking on the aqueous polyurethane emulsion by Co-60 gamma rays to obtain the internal-crosslinking aqueous polyurethane emulsion. In the invention, the emulsion is irradiated by using the Co-60 gamma rays to realize the crosslinking of the emulsion, so that the molecular weight of the aqueous polyurethane can be effectively improved, and the aqueous polyurethane emulsion can have higher solid content and better mechanical performance.

Description

technical field [0001] The invention relates to an internal crosslinking water-based polyurethane emulsion and a preparation method thereof, belonging to the field of fine polymer materials and preparation thereof. Background technique [0002] Water-based polyurethane (WPU) is a kind of polymer synthetic material, which has the advantages of wear resistance, corrosion resistance, low temperature flexibility, fatigue resistance, etc. It can be used as adhesives for shoes, coatings, fabric coatings, various packaging Adhesives for products, etc., which use water as the dispersion medium, have the advantages of non-combustibility, environmental protection, and little irritation to the human body. Therefore, replacing traditional solvent-based polyurethane with water-based polyurethane emulsion is an important development direction of polyurethane adhesive products. [0003] The molecular chain of water-based polyurethane contains a large number of hydrophilic groups, and its ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08J3/28C08J3/24C08J3/03C08G18/67C08G18/66
Inventor 酒永斌翟宇曾心苗王连才郭建梅鲍矛
Owner BEIJING RADIATION APPL RES CENT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap